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The vulnerability arises from a type confusion error within the Desktop Window Manager (DWM) component of Windows. Type confusion occurs when a program attempts to access a resource as an incompatible type, leading to memory corruption. An authenticated attacker can leverage this by executing a specially crafted application to trigger the flaw. The DWM runs with elevated privileges, and by causing it to misread memory, the attacker can write arbitrary data to unauthorized memory locations. This allows for arbitrary code execution within the context of the DWM process. Since the DWM operates at a higher integrity level, successful exploitation results in the attacker gaining those higher privileges, effectively achieving local privilege escalation from a standard user account to a more privileged system level .
dailycve form:
Platform: Windows DWM
Version: Multiple Versions
Vulnerability: Type Confusion
Severity: HIGH
date: 2025-01-21
Prediction: include expected Patch date.
(end of form)
What Undercode Say:
Analytics
- CVSS Score: 7.8 (HIGH)
- Attack Vector: Local
- Complexity: Low
- Privileges Required: Low
- User Interaction: None
- Scope: Unchanged
- Confidentiality: High
- Integrity: High
- Availability: High
Commands
Check DWM version (dwm.exe is part of Windows)
Navigate to System32 and check file details
cd C:\Windows\System32
Get-Item .\dwm.exe | Format-List ProductVersion, FileVersion
Alternative: Use wmic to check OS version and build
wmic os get Caption, Version, BuildNumber
Check for specific security updates related to CVE-2025-21499
Get-HotFix | Where-Object {$_.HotFixID -like "505"} Example patch naming convention
Simulate checking for vulnerable versions (PowerShell)
$osBuild = [bash]::OSVersion.Version.Build
if ($osBuild -lt 22000) { Write-Host "Potentially vulnerable build detected." }
Exploit:
- An attacker must have valid login credentials and be able to execute code locally.
- The exploit targets the Desktop Window Manager (dwm.exe) .
- By causing a type confusion, the attacker corrupts DWM memory.
- This corruption leads to arbitrary code execution with DWM’s privileges.
- DWM typically runs as SYSTEM, enabling privilege escalation.
Protection from this CVE
- Apply the official security update from Microsoft’s January 2025 Patch Tuesday.
- Ensure Windows Defender and antivirus definitions are up to date.
- Implement the principle of least privilege for user accounts.
- Enable Windows Defender Exploit Guard (Controlled Folder Access).
- Monitor Event Viewer logs for unusual DWM crashes or errors.
Impact
- Successful exploitation allows an attacker to gain SYSTEM privileges.
- This compromises the confidentiality, integrity, and availability of the host .
- An attacker can install programs, view/change/delete data, or create new accounts with full user rights.
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Sources:
Reported By: www.cve.org
Extra Source Hub:
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